Harmonic telegraph



(No ModeL) E. BERLINER.

HARMONVIG TELEGRAPH. v

No. 258,356. Patented May 23, 1882.

WIINF UNITED STATES PATENT OFFICE.

EMILE BEBLINER, OF BOSTON, MASSACHUSETTS.

IHARMONIC TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 258,356, dated May 23,1882.

Application filed March 4, 1882. (No model.) 7

To all whom/it may concern Be'it known that I, EMILE BERLINER, ofBoston, in the county of Suffolk and State of Massachusetts,haveinvented certain Improvements in Harmonic Telegraphs, of which thefollowing is a specification.

The invention is applicable inall systems of telegraphing in whichseries of waves corresponding to the pendulous vibrations of severalreeds are sent over a line, which appear at the receiving stationseither as recognizable tones or in the form of synchronous motions ofslow-moving reeds or pendulums. Such systems comprise the so-ealledharmonic telegraphs, and they comprise two subsystems, viz: thepulsatory and the undulatory. In the formervibrating reeds or diaphragmsclose a battery-circuit at each vibration, thereby producing electricalpulsations in the line. In the latter these reeds or diaphragms vibratein front of coils and magnets and produce electric undulations in theline. If several series of pulsations or undulations are sentsimultaneously, they are capable of being analyzed atthereceiving-station, so that each series affects one certainreceiving-instrument only or particularly. Such receiving-instrumentsmay be reeds or diaphragm-resonators, vibrated by elcctromagnet-s,through which the line passes.

My present application refers to a simple mechanical device for sendingundulations; and it consists essentially of a shaft worked by machineryand several current producing wheels moved simultaneously by said shaft.

In the drawings, Figure l'shows the shaft as applied to the undulatorysystem, and Fig. 2 shows a wheel, magnet, and coil separately anddetached from the rest. a

In Fig. 1, O, O, and (J are current-producing wheels upon the revolvingshaft A, moved by the power 0. These wheels are of iron or steel, andrevolve before the magnets h It It, provided with coils g g When not inuse these coils are short-circuited through the keys K K K but the linetouches each of the circuits and the key K is grounded at E.

Fig. 2 shows in section a current-producing iron wheel, 0, provided withteeth z t, and revolving before magnet h and coil g. Each of the wheelsbelonging to one system has a number of teeth different from the othersof the same system. Hence, by revolving the shaft A, and thereby thewheels 0 C O, and depressing, as is shown, with the key K, also the keysK and K three distinct series of electric undulations, each at a rateper minute different from the others, will pass into the line L. At theend of the respective lines these electric series of waves can beanalyzed by means of forks, reeds, or resonators, as well known to thoseunderstanding harmonic-telegraph systems.

It is of course necessary that the shaft A should revolve uniformly andwith the same velocity at all times, and, furthermore, that for eachwheel representing a series of electric waves an analyzing fork, reed,or resonator should exist at the receiving-station which is particularlyaffected by the said series of waves. If, now, the Morse keys are usedsimultaneously by operators, each operator upon depressing his key sendsa certain series of waves to the line, and, though the series of eachsystem pass together over the sameline,

they separately manifest themselves at the distant station, beinganalyzed by correspondin g reeds, forks, or resonators.

- What I claim is- In a harmonic telegraph, ashaft giving motionsimultaneously to several iron or steel wheels placed in a magneticfieldin proximity with wire coils, each wheel having teeth different innumber in a given segment from the other wheels, and thereby producingelectric undulations in each coil at a rate per minute different fromthe rest, substantially as described.

In testimony whereofI have signed my name to this specification, in thepresence of two subscribing witnesses, this 2d day of March, 1882.

EMILE BERLINER.

. Witnesses:

GEo. WILLIS Pruner], JOSEPH N. OoNDLY.

